问题补充：
--- What are you going to do this weekend?
--- There a concert at school. I’m going to listen there.
A. is going to have
B. is going to be
C. will have
D. has
答案：
A. is going to have
(答案→)B. is going to be
C. will have
D. has
解析：句意:这个周末你打算做什么?——学校有一场音乐会。我要去那儿听。There be句型表示“某地(或某时)存在有某人(或某物)，而并非某地(某人、某物或某时)拥有什么东西”，句中有若干个名词作主语，动词be常与后面主语中的第一个名词在数上一致。have一般表示某人有某物。结合语境可知本句描述的是将来发生的动作，故用一般将来时态，选B。
